Calking gun



CAULKING GUN Filed Dec. 5. 1938 A TTORNEY5 Patented Dec.v l5, 1.942

UNITED STATES y.PATENT OFFICE CALKING Clarence Leroy Coates, Hastings, Nebr., assignor to W. M. Dutton & Sons Co., Hastings, Nebrr, a corporation of Nebraska Application December 5, 1938, Seriai No. 244,023

yand piston arrangement together with a mechaism adapted to apply force against the piston rod in order to force it through a -calking stroke which includes a cam block means pierced by 'the rod adapted to be tilted so as t0 grip the rod and drive it through the calking stroke.

Still another object is the provision of a cam 'means for operating a piston rod which includes a set of cams pierced by the rod in such a man- 'ner that one cam may be tilted to gripY the rod and drive it through a calking stroke while the 'other cam is tilted slightly forming a resistance totmotion of the rod so that when a cam actuating mechanism is withdrawn preparatory to making a second stroke the other cam will maintain a sufficient grip upon the rod to prevent it from withdrawing from its advanced position.

A further object is to provide a new and im- 'proved cam block on the `piston rod which is nor'- mally tilted at an angle so as to v'provide edges 'Sharper than 90 for gripping the piston rod dui"- ing an actuating motion in order that a non- -slipping positive grip may be achieved, the gun 'being further provided with an adjustment for properly positioning the actuating cam block upon release from an actuatir'ig position in order that the axis of' the aperture therethrough may be concentric and parallel with' the, aXisof the piston rod to permit the latter to be freely withdrawn during' a loading operation.

A further object still is the provision of an actuating mechanism for the piston rod of a calking gun which incorporates a pair of actuating devices, one adapted to vforce 'an actuating cam block into engagement with a piston rodand drive it through a dispensing stroke and another coop' er'able with the first adapted to maintain its position rentive to a. retaining cam block while maintaining' a iixed adjustment relative totherst device so that only' a limited resistant bin-d ing will vbe applied against the rodfor lbraking purposes and which is further constructed 1n a mfi'i' SIIC-h that Vthe braking action ma'T be removed by automatic return of the mechanical portions of the device to an initial position to permit withdrawal of the piston and piston rod during a loading stroke. K y

With these and other objects in view, my ine vention consists in the construction, arrangement and combination of the various parts of my de'- vice, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointe ed out in my claims, and illustrated in the ac*- -compan'y'ing drawing, in which:

Figure l is a perspective View of my device.

Figure 2 is a longitudinal sectional View of my device showing the actuating parts in retracted position. l n

Figure 3 is a fragmentary longitudinal view 'in section showing the actuating parts in the beginning of a dispensing stroke.

Figure4 4 is a fragmentary longitudinal view in section showing the actuating parts in thel completion of a dispensing stroke.

Figure 5y is a top view in section taken on the line 5-5 of Figure 3.

In the manufacture of calking guns it is coni venient to have a gun of substantial capacity which at the same time can be easily carried about and manually operated. Such 'a gun moreover must since manually actuated be provided with a means of multiplying the 'I'anual force sum-cient so that a considerable pressure can be put upon a reservoir of calking material, which is frequently of a rather viscous and noni-lowing' character, in order `that the calking material may be injected into a joint with sufficient force so as to vproperly fill it.

In the embodiment of my device shown herein there is provided a barrel orr cylinder Ill forming a reservoir I'2 for the calking material, said barrel or cylinder being provided with a llercap I4 terminatingin a dispensing projection I5 and an applicator nozzle Il from which the calking material is ejected into a joint.

The gun as' a 4unit in'cludes a frame or casing i8 at the opposite end of the cylinder provided with a hollow central portion I9 closed by a cover 2l. A stationary handle or grip 20 is vsecured to the casing adapted to be grasped by the user. In the cylinder there is provided a piston formed with two oppositely positioned cups 22 of some pliable semiresilient material held in place by a pair of correspondingly positioned metalcups 24. rhese are held together by means of a piston rod 26 having a reduced end portion 28 piercing` the cups which are held thereon by a lock nut 3U.

The piston rod 26 terminates in a handle 32 by means of which the rod and piston may be withdrawn during a loading operation which is ordinarily accomplished by removing the capl I4 and lling the cylinder with a calking material. During a dispensing stroke the piston is moved in an opposite direction or in a direction from right to left as viewed in the drawing.

The cylinder head is Closed by a cap 34 which need not be tightly sealed, the cap being provided with an aperture 36 to admit the piston rod 26.

For forcing the piston rod through a forward or ejecting stroke there is provided a movable handle 38 pivoted to the casing I8 within the open central portion I9 by a pin 40. movable handle is designed to be received into an opening 39 within the grip I8. This handle is provided with a projection 42 on which is positioned a roller 44, and a pin 46, the purpose of f which will be subsequently described. The actuating handle member is adapted to pivot freely about the pivot pin 40.

To supply a driving engagement with the piston rod 26 there is provided a cam block 48 which has a central hole 50 pierced at an angle relative to the face of the block in order to provide sharp edges for gripping the piston rod. The cam. block is urged to a released position such as that shown in Figure 2 by means of a coiled spring 52.

An adjusted screw 54 is provided for setting the angular position of the cam block 48 when the mechanism is released, so that the axis of the aperture 50 may lie coincident with the Vaxis of the piston rod 26 in order to permit the piston rod to be freely withdrawn. During the actuatfi ing stroke when the actuating handle 38 is pivoted the roller 44 is pivoted against the lower inclined side of the cam block 48 tending to tilt the block slightly toward a vertical position thereby causing the edges to bite into the piston rod and drive it through a dispensing stroke until limited by completion of forward motion of the actuating handle. During this actuating operation the roller 44 rolls over the contacted surface of the cam block 48 so that there will be no additional binding diiculty.

During the dispensing stroke the motion of the piston rod is resisted slightly by means of a locking cam block 56 which is provided with an aperture 58 at substantially right angles to its faces pierced by the piston rod 26. When tilted slightly, the locking cam block is adapted to occupy a releasable locking position. A bracket 51 holds the cam block in p-lace against which it is urged to a normally disengaged position by means of a '7 coiled spring 10.

There is provided in addition a pawl 68 pivoted upon a pin 62 in the casing I8 having an extension 64 adapted to contact with the lower side of the locking cam block 56 in order to tilt it slightly. The locking cam block, however, is not designed to be tilted sufliciently to prevent sliding of the piston rod through its aperture. In order that the pressure thereon may be kept constant throughout a feeding stroke the pawl 60 is provided with a cam track 66 which has a curved surface such that it forms an arc of a curved track drawn about the pin 40 as a center. The cam track is provided at one end with a recess 68. For actuating the pawl there is provided the pin 46 which is movable by the actuating portion of the handle. The locking cam block is designed to be continually urged to a released position by means of the spring 10."

As it pivots the Operation In operation the actuating handle grip 38 first occupies the position shown in Figure 2 to which it is forced by means of the coiled spring 52 pressing against the actuating cam block 48. In this position the actuating cam block is tilted as shown, the adjusting screw 54 being adjusted in such a manner that the central biased aperture in the cam block 48 is concentric with the axis of the piston rod. In the same position the pin 46 is received in the recess 68 provided for it at the end of the cam track. This also provides a release for the pawl 60 in such a manner that the locking cam block may be free to permit the piston rod to be withdrawn. The coiled spring 52 when urging the actuating cam block toward an inoperative position likewise urges the actuator handle 38 to a position for beginning a dispensing stroke.

When the actuating handle grip is manually actuated by pulling it backwards against the stationary hand grip the extension bearing the roller 44 presses against the lower tilted side of the actuating cam block tending to tilt it slightly and in so doing force the piston rod 26 through its dispensing stroke. At the same time, the pin 46 is drawn out of the recess 68 and made to travel along the cam track 66, the location of which is positioned such that the extension 64 of the pawl is then pressed just slightly into contact with the locking cam block. Due to the mechanical advantage of the pivoted part 5a considerable force is exerted upon the piston rod in order to force the piston through a dispensing stroke. j

As the actuating stroke is continuing the pin 46 rides over the .cam track 66 maintaining the pawl 60 in the position first assumed without pressing it any tighter against the locking cam block. In the meantime the extension 42 and roller 44 together with the actuating cam block 48 move the rod and piston through a full dispensing stroke, the completed position of which is shown in Figure 4. When the actuating handle is then released all of the pivoting parts are returned to their initial position and the coiled springs 52 and 'I0 push the cam blocks into their proper released position. After vthe piston rod and piston have been driven completely through asuccession of dispensing strokes suicient to empty the cylinder it then becomes necessary to rell the cylinder. Therefore,V with the actuating parts in a released position such as shown in Figure 2 both of the cam blocks are spring pressed into such a position that the axes of their perforations are parallel to the axis -of the piston rod 26. Then by means of gripping the handle 32 of the piston rod the rod can be slid through the perforations in order to withdraw the piston while the nozzle I`I and cap I4 are removed for filling the cylinder with a calking preparation preparatory to another succession of dispensing strokes.

There has therefore been provided a convenient manually actuated high pressure calking gun incorporating a simplified mechanism adapted to drive it through a succession of dispensing strokes which includes a locking means for preventing the retraction of the piston during any of the succession of dispensing strokes, there being also provided a convenient means for releas-I ing the mechanism in order that the gun may-be refilled. f

Some changes Hmaybe made kin the construe-1 tion and arrangement of the parts of my device without departing from the real spirit and purpose of my invention, and it is my intention to A'cover by my claims any modified forms of structure, or use of mechanical equivalents, which :1 may be reasonably included Within their scope.

I claim as my invention: 1.; .In a reciprocating piston device comprising a barrel and a piston having an extension mounted reciprocably therein, a mechanism cooperable with the piston providing for retracting the piston and for forcing the piston in an opposite -direction comprising a stationary grip and an actuator member movably mounted thereon, anactuator cam block positioned in gripping relation;

With the piston extension andan extension on vthe actuator member adapted to shift the relative position of said actuator cam block into gripping position on the piston extension vand to move it through a dispensing stroke, a locking cam block.

positioned in gripping relation with said piston extension adapted to be shifted to a sliding grip position therewith for checking retraction of the piston after a dispensing operation, a lock shifting member movably mounted upon the stationary grip adapted to shift the position of said locking cam and a shifting element on the actuator member cooperable With said lock shifting on said track to hold said locking cam block in a sliding grip position during reciprocation of the actuator cam block.

4. In a reciprocating device mounted on a frame having a reciprocating rod therein, a rod locking mechanism comprising a locking device for releasably holding the piston during reciprocation thereof comprising an actuator handle movably connected to the frame, a cam thereon,

a pawl movably mounted relative to the frame provided with a projection and with a cam track,

and a locking cam block having an aperture 'therein pierced by the piston rod adapted to be tilted to a slidable rod gripping position by action of the projection thereagainst While the cam passes vover said track, said pawl having a recess adjacent the cam track adapted to receive the cam to release the pawl from the cam block so member to hold said locking cam block in lock- Y ing position during retraction of the actuator .z

cam block.

2. A reciprocating piston device comprising a barrel and a piston therein, a reciprocating rod for manually retracting the piston and a manually operated mechanism cooperable with the rod for forcing the piston in an opposite direction, said mechanism comprising a stationary grip and an actuator member movably mounted thereon, anactuator cam block having a portion positioned around the rod and an extension on the actuator member to tilt said actuator cam block into gripping relation with the rod and to force it through a dispensing stroke, a locking cam block having a portion positioned around the rod adapted to be tilted into a sliding grip relation.,

with the rod for checking retraction of the rod after operation in said opposite direction, a pawl movably mounted upon the stationary grip provided With a portion for tilting said locking cam block and with a cam track, a cam on the actu- ,3,

ator handle slidable on said track to hold said locking cam block in locking position during reciprocation of the actuator cam block.

3. A reciprocating piston device comprising a barrel and a piston therein, a rod for manually retracting the piston and a manually operated mechanism cooperable with the rod for forcing the piston in an opposite direction, said mechanism comprising a stationary grip and a movable actuator handle pivotally attached thereto, a reciprocating actuator cam block having an aperture positioned around the rod and an extension on the handle adapted to be moved against said actuator cam block to tilt it from an initial position into gripping relation With the rod and to force it through a stroke in said opposite direction, 'and' means for returning it to the initial position, a locking cam block having an aperture positioned around the rod adapted to be tilted to a sliding grip relation with the rod for checking retraction of the rod after an operation in said opposite direction, a pawl pivoted to the stationary grip provided With an extension for4 that the rod: is free to shift endwise. through sai-d aperture.

' 5. ln a reciprocating device mounted on a frame having a reciprocating rod therein, a releasable rod locking mechanism comprising a locking device for releasably holding the rod during reoiprocation thereof comprising an actuator handle pivotally connected to the frame, a cam thereon, a pawl movably mounted on the frame provided With a projection at one side and with a cam track at another side, a locking cam block having an aperture therein pierced by the rod adapted to be tilted to maintain a constant slidable rod gripping position by action of the projection thereagainst while the cam passes over said track, said pawl having a recess adjacent the cam track adapted to receive the cam to release the pawl from the cam block and a spring /jfor pressing said cam block to `a normal nonone direction and a stationary grip, the combina-l tion of a locking device for maintaining the advance of said piston comprising a movable actuator handle having a pivot pin connecting it to the stationary grip, a cam roller on the handle, a pawl pivoted to the stationary grip provided with a projection at one side and a cam track at the opposite side curved about the pivot pin as a center point, a locking cam block having an aperture therein pierced by the piston rod adapted to be tilted to a slidable rod gripping position by action of the pavvl projection thereagainst While the cam roller is rolled along, said cam track having a recess adapted to receive the roller in a normal nongripping position wherein the pawl is withdrawn from the cam block, and a spring for pressing said cam block to the normal nongripping position so that the rod and piston may be freely Withdrawn in the opposite direction.

'7. In a plastic material dispenser having a piston rod adapted to be impelled forwardly to expel the material and to be retracted when the dispenser is to be refilled; a gripping member for actuating said piston rod, automatic means for returning said gripping member to an inoperative position, a hand lever having a portion engaging said rod gripping member to actuate the same; and means for preventing improper return movement of the piston rod comprising a plate member adapted to hold said piston rod against improper rearward movement, an abut' turning said plate member to its inoperative position, and means operated by the hand lever vfor impelling said plate member to its operative position.

8. In a plastic material dispenser having a piston rod adapted to be impelled forwardly to expel the material and to be retracted when the dispenser is to be refilled; the means for actuating said piston rod comprising a gripping member having an `aperture through which said piston V.rod exten-ds, said aperture being slightly larger than the diameter of the piston rod whereby when said member is tiltedr the piston rod will be gripped thereby, a spring bearing against said gripping member and adapted to return the same automatically to an inoperative position, a hand lever having a portion engaging said rod gripping member and adapted to first tilt the same lto rod gripping position andY thereafter to impel the same forwardly; kand means for preventing improper return movement of the piston rod comprising a plate member having an aperture through Whichsaid piston rod extends, said aperture being slightly larger than the diameter'of the piston rod whereby when said plate member is tilted said piston rodv will be held against improper rearward movement, an abutment against which said plate member rests in its inoperative position, a spring bearing `against said plate member and adapted to return the same automatically'to its inoperative position, a lever having a portion engaging said plate member and adapted to rst tilt the same and then impel it forwardly to its operative position, said lever being actuated by a member carried by the hand lever and being shaped to maintain said plate member in itsroperative position during subsequent rod operating movements of the hand lever.

CLARENCE LEROY COATES. 

